I considering and exteral hard drive and DVD writer, but most of the enclosures that I see around my price range are USB 2.0. I would like a firewire though. What do you guys recommend. Firewire or USB 2.0 enclosure?

There's no advantage to him getting a more expensive firewire enclosure for an external DVD writer, is there?

Not sure about the speed difference between FireWire and USB 2.0 for DVD writing, but the OP asked about external hard drives as well. Here, I think a few extra dollars in expense is well invested to get an enclosure that's more adaptable.

I'm assuming that he'd have to get two external enclosures (one for the drive, one for the DVD), so was wondering if he could save some money and get a USB one for DVD if the FireWire didn't offer any advantages.

I don't believe that iDVD and Disk Utility will recognise a USB 2.0 burner for burning DVDs! Those programs have been very choosy about external burners in the past and I don't think that it is much better now.